Cinergy Corp. ( ) was an
energy
Energy () is the physical quantity, quantitative physical property, property that is transferred to a physical body, body or to a physical system, recognizable in the performance of Work (thermodynamics), work and in the form of heat and l ...
company based in
Cincinnati, Ohio
Cincinnati ( ; colloquially nicknamed Cincy) is a city in Hamilton County, Ohio, United States, and its county seat. Settled in 1788, the city is located on the northern side of the confluence of the Licking River (Kentucky), Licking and Ohio Ri ...
, United States, from 1994 to 2006. Its name is a play on the words "
synergy
Synergy is an interaction or cooperation giving rise to a whole that is greater than the simple sum of its parts (i.e., a non-linear addition of force, energy, or effect). The term ''synergy'' comes from the Attic Greek word συνεργία ' f ...
", "energy", and "Cincinnati".
History
Cinergy was created on October 24, 1994, from the merger of the Cincinnati Gas & Electric Company (CG&E) and
Kentucky
Kentucky (, ), officially the Commonwealth of Kentucky, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders Illinois, Indiana, and Ohio to the north, West Virginia to the ...
subsidiary Union Light, Heat & Power (ULH&P) with
Plainfield, Indiana
Plainfield is a town in Guilford Township, Hendricks County, Indiana, Guilford, Liberty Township, Hendricks County, Indiana, Liberty, and Washington Township, Hendricks County, Indiana, Washington townships, Hendricks County, Indiana, Hendricks ...
–based PSI Energy (Public Service Indiana).

In 1996,
Riverfront Stadium
Riverfront Stadium, also known as Cinergy Field from 1996 to 2002, was a multi-purpose stadium in Cincinnati, Ohio. It was the home of the Cincinnati Reds of Major League Baseball (MLB) from 1970 Cincinnati Reds season, 1970 through 2002 Cincinna ...
in Downtown Cincinnati was renamed Cinergy Field in a sponsorship deal with Cinergy. The stadium was demolished by implosion in December 2002 to make way for
Great American Ball Park
Great American Ball Park is a baseball stadium in Cincinnati, Ohio, United States. It is the ballpark of Major League Baseball's Cincinnati Reds, and opened on March 31, 2003, replacing Cinergy Field (formerly Riverfront Stadium), the Reds' fo ...
.
In 2005, Cinergy announced a friendly acquisition by the larger
Charlotte, North Carolina
Charlotte ( ) is the List of municipalities in North Carolina, most populous city in the U.S. state of North Carolina and the county seat of Mecklenburg County, North Carolina, Mecklenburg County. The population was 874,579 at the 2020 United ...
–based
Duke Energy
Duke Energy Corporation is an American electric power and natural gas holding company headquartered in Charlotte, North Carolina. The company ranked as the 141st largest company in the United States in 2024 – its highest-ever placement on the ...
. The acquisition was completed on April 3, 2006. The combined company retains the Duke Energy name. Until the acquisition, Cinergy still operated under the names of the three local utilities (e.g., Cinergy/CG&E in Cincinnati); since the acquisition, the names of the three former Cinergy utilities and Duke Power, the former Duke Energy utility subsidiary, have been phased out,
although signs bearing the former logos still remain at some
substations.
Environmental record
In May 2006, Cinergy was flagged as a key contributor to major pollution in the
American Midwest
The Midwestern United States (also referred to as the Midwest, the Heartland or the American Midwest) is one of the four List of regions of the United States, census regions defined by the United States Census Bureau. It occupies the northern c ...
, prompting the
New York State
New York, also called New York State, is a state in the northeastern United States. Bordered by New England to the east, Canada to the north, and Pennsylvania and New Jersey to the south, its territory extends into both the Atlantic Ocean and ...
government to sue the company and forcing the company to install modern pollution control equipment. The
Ontario
Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...
government, across the border in
Canada
Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...
, followed suit at the request of
New York Attorney General
The attorney general of New York is the chief legal officer of the U.S. state of New York and head of the Department of Law of the state government. The office has existed in various forms since 1626, originally established under the Dutch c ...
Eliot Spitzer
Eliot Laurence Spitzer (born June 10, 1959) is an American politician and attorney who served as the 54th governor of New York from 2007 until his resignation in 2008 after a prostitution scandal. A member of the Democratic Party, he was also ...
.
Researchers at the
University of Massachusetts Amherst
The University of Massachusetts Amherst (UMass Amherst) is a public land-grant research university in Amherst, Massachusetts, United States. It is the flagship campus of the University of Massachusetts system and was founded in 1863 as the ...
have identified Cinergy as the 49th-largest corporate producer of
air pollution in the United States
Air pollution is the introduction of chemicals, Atmospheric particulate matter, particulate matter, or biotic material, biological materials into the Earth's atmosphere, atmosphere that cause harm or discomfort to humans or other living organisms ...
, with roughly 29 million pounds of toxic chemicals released annually into the air. Major pollutants indicated by the study include
sulfuric acid
Sulfuric acid (American spelling and the preferred IUPAC name) or sulphuric acid (English in the Commonwealth of Nations, Commonwealth spelling), known in antiquity as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen, ...
,
hydrochloric acid
Hydrochloric acid, also known as muriatic acid or spirits of salt, is an aqueous solution of hydrogen chloride (HCl). It is a colorless solution with a distinctive pungency, pungent smell. It is classified as a acid strength, strong acid. It is ...
,
chromium
Chromium is a chemical element; it has Symbol (chemistry), symbol Cr and atomic number 24. It is the first element in Group 6 element, group 6. It is a steely-grey, Luster (mineralogy), lustrous, hard, and brittle transition metal.
Chromium ...
compounds, and
manganese
Manganese is a chemical element; it has Symbol (chemistry), symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese was first isolated in the 1770s. It is a transition m ...
compounds.
Toxics Release Inventory courtesy rtknet.org
Holiday model train display
Under its various operating names, the company operated a holiday model train display that has attracted over 9 million visitors since the event's inception in 1946. The authentic display measures long and imitates an O gauge, in which a quarter-inch on the model is equivalent to one foot on a real train.
Duke, in partnership with railway company CSX
CSX Transportation , known colloquially as simply CSX, is a Railroad classes, Class I freight railroad company operating in the Eastern United States and the Canadian provinces of Ontario and Quebec. Operating about 21,000 route miles () of trac ...
, continued to host the annual train display in Cinergy's former headquarters until 2011, when the display was donated to the Cincinnati Museum Center at Union Terminal.
References
External links
Cinergy is now Duke Energy
Merger Information
* {{cite web, url=http://www.cinergy.com/standards/default.htm, title=Cinergy Corporate Standards, access-date=April 12, 2017, archiveurl=https://web.archive.org/web/20061005184417/http://www.cinergy.com/standards/default.htm, archivedate=October 5, 2006, url-status=dead – signage and logo information prior to the merger
Companies disestablished in 2006
Defunct companies based in Cincinnati
Duke Energy
Electric power companies of the United States
Energy companies established in 1994